Stencil-printing machine.



PATENTED DEC. 17

2 SHEER-SHEET 1.

A B DICK STENCIL PRINTING MACHINE.

APPLICATION FILED MAY 28 1907 ATTOR\EY man STATES PATENT OFFICE.

ALBERT B. DICK, OF LAKE FOREST,.ILLINOIS, ASSIGNOR TO A. B. DIOK COMPANY, OF CHICAGO,-ILLINOIS, A CORPORATION OF ILLINOIS.

STENCIL-PRINTING momma;

I To all whom it may-concern: I Be it known that I, ALBERT B. DIcK,-a

citizen of the United States, residing at Lake Forest, in the county of Lake and State of Illinois, have inve'ntetla certain new and useful Improvement in Stencil-Printing Machines, of which the following is a specification.

T his invention relates particularly to that type of printing-machines wherein is employed a rotary drum upon the surface whereof is secured a waxed stencil-sheet, through the t e openings in which the printing is accomplished upon a suitable impression-sheet fed between the periphery of such drum and an underlying platen, such as a pressure roller. means of a pad arranged upon the drum beneath the stencil-sheet. The tendency of such ink when deposited upon the impressionsheet is to cause such sheet to adhere to the drum, which is one of the difiiculties avoided in the ap aratus of this invention. This is particular y true where the printing on the impression-sheet commences close to the advancing edge of such sheet. Where the printing upon such sheet commences at a suitable distance from the top of the sheet, the resiliency of the paper is usually sufficient to permit the same to coact with the sheetstrippers commonly employed and whose functionit is to prevent t 1e adherence of the sheet to the drum. v

Under the present invention, I retain-the sheetstrippers heretofore commonly employed and which extend close to the point of coaction between the peripheryof the printing-drum and that of the underlying pressureroller, but increase the efficiency and reliability of such strippers by providing, upon either side of the periphery of the drum, a sheet-guide operating to restram the 1mpression-sheet, along its side edges, from being brought into contact with the stencilsheet, to which it otherwisemight adhere.- These guides do not preclude intimate coaction of the impression-sheet between its side I edges and the operative surface of the stencilsheet, but serve to direct such edges of the impression-sheet to the point of coaction of the sheet strippers therewith. In a prealso serve measurably to protect the stencilsheet at the forward port-ion thereof, which is commonly subjected to greatest wear.

The ink is supplied by Specification of Ltters fatent.

Patented Dec. 17, 1907.

p I Application filed May 28. 1907. am No. 376.124.

They also serve to avoid accidental detachment of the forward portion of the stencilsheet from the drum.

-The invention is illustrated in the accompanying drawings, in which I igure '1 is an end elevation, partly in section, ,of a stencil-printing machlne embodying my invention; Fig. 2 is a cross-section illustrating a portion of the machine, particularly that part of the printingdrum which is equipped with the guides above referred to; and Figs. 3 and-4 are details illustrating modified form's in which the invention may be employed.

Referring to these drawings, it will be seen that the machine includes the side members A, A, of the frame, in whichis journaled by means of suitable stub-shafts the drum B having a surface of foraniinated material 11 secured to heads b, 11 The stencil-sheet C is secured upon this drum, the forward edge, in the-present instance, by means of the button-bar b and the rearward edge by means of the bail I). Said drum may be operated by means of the handle D and gears d.

Directly underlying the printing-drum, is the pressure-roller E mounted upon hinged "arms a and movable to operative or inoperativeposition byymeans of the shaft e and cam e Extending inwardly-from each of the side members A, A, of the frame, is a projection F forming part of the tension device'for the pressure-roller E and in addition carrying a sheet stripperf, thefree endwhereof terminates close to the point of coaction of the stencil carrying drum and pressure roller. As will be understood, the strippers f, one carried by each of the projections F, lie on either side of the machine in such position that the edges of the impression-sheet f W11 pass below the same and thereby be prevented from adhering to the surface of the stencil. 1

Turning now to the sheet-guides these are here shown as forming adjuncts of the stepoil-printing drum, being secured to and carried by said drum adjacent to the heads forming-part thereof. In the referred form, illustrated in Fi s. land 2, t ese uides are shown as pivotafiy mounted upon aid drum.

Since they are both the same in construction, ferred form of the invention, these guides i but one need be described in dtaili As best shown in Fig. 2, the guide G is'pivoted at g to the inner surface of the head I) through an ofl'setting boss g and takes the form of an arm, the rearward portion g whereof, when the guideis in operative osition, extends over the button-bar b to W 'ch the forward edge of the stencil C'is secured and over the forward portion of the stencil secured upon said bar but only adjacent to the side margins of said stencil. The outer edge 9 of said said guide and the inner surface of'said head.

' That portion of said pin rojecting inwardly from the inner surface 0' said guide may be used as a handle with which said guide may be thrown to one or the other .of its'two positions. In either of said positions, it is held against accidental displacement by means of said springs g or 9 In. its inoperative position, said guide is held within the drum and therefore out of the way. This is the position to which both the guides are thrown when it is desired to remove a stencil-sheet or to place a new stencil-sheet in position. After the old stencil has been removed and a new one substituted, the guides may readily be moved by means of the inwardly project- 'ing ends of the pins g to their operative position, in which they are illustrated in the drawing, in which position they will be held by the springs g above described. ,In this position, in addition to affording protection to the stencil-sheet over a substantial part of its forward end, said guides have the effect. of increasing the diameter of the printing-'- drum at the points of their location, as a con- .sequence whereof the side margins of the impression-sheet, at the forward edge of such sheet, are turned somewhat away from the periphery of the drum, leaving a space of sufficient size for theintroduction of the free ends of the sheet-strippers f as the 'move ment of the drum, and therefore that of the impression-sheet, is continued: As a result, no matter howclose to the advancing edge of the impressionsheet the characters of the stencil-sheet are imprinted, the tendency of the impression-sheet to adhere to the stencil, under the influence of the ink, is overcome and the strippers areenabled to separate said sheet from said drum and permit the same to fall upon the support of the machine or into a suitable tray placed rearward of the machine for that purpose.

i In Figs. 3 and 4, I have illustrated two modifications of the construction herein described, the former of these comprising a sleeve H adjustably mounted upon the stubshaft h of the stencil-carrying drum, so that in order to renew the stencil-sheet upon said drum said sleeve may be slid upon said stubshaft toward the left, thereby exposing the foraminated surface of said After the stencil has been placed in position, the

sleeve may be moved to the position illustrated in Fig. 3 and there secured by any suitable means, as, for instance, the set-screw h. In- Fig. 4, the head is shown as recessed for the reception of the foraminated stencilcarrier, leaving an annular projection h having the effect to increase the diameter of the drum as a whole, adjacent tothe edges of such drum, the portions h therefore serving,

like the. sleeve H, to slightly depress the lateral edges of the impression-sheet it so as to guide the same beneath the free ends of the sheet-strippers Havingnow described my invention, what I claim as new-therein and desireto secure by :Letters Patent is as follows 1. The combination with a printing-drum and an underlying platen, of sheet-strippers adapted to coaet with an impression-sheet fed to said drum, and means carried by said drum and operating, when in normal, fixed position, to increase the diameter thereof at points corresponding to the lateral edges of said sheet, substantially as described.

2-. The combination with a printing-drum and an underlying platen, of guides mounted in position to coact with the lateral ed es only of a sheet on said drum, said guides eing secured to and normally extending in fixed position beyond the peri hery of said drum, Substantially as described.

3. The combination with a rotatable printing-drum and an underlying platen, of guides secured to the drum and movable relatively thereto, independently of the rotation of the drum, to operative and inoperative positions, said guides normally and when in operative position extending fixedly beyond the periphery of the drum, substantially as described.

4. The combination with a Inovable'printing-drum and an underlying laten, ofides secu'red to and extending eyond t e periphery of said drum, and means inde endent of the movement of said drum for t rowing 1 said guides to operative and inoperative positions, in the former 'of which such guides extend fixedly beyond the periphery of said drum, substantially as described.

5. Thecombination with a printing-drum and an underlying )laten, of guides secured to and extendingl ieyond the periphery of said drum, means for throwing said guides to operative and inoperative positions, and mechanism for retaining said guides in either of said positions, substantially as described.

6. The combination with a printing-drum and an underlying platen, of means carried by said drum and coacting with an impression-sheet fed thereto to bend the lateral edges of such sheet out of a plane said means extending over the forward edge of the stenoil-sheet upon said drum adjacent to its side margins, substantially as described.

7. The combination with a printing-drum .and an underlying platen, of a guide pivotally mounted upon said drum and extending beyond the periphery thereof, said guide being movable to operative and inoperative positions, in the latter of which it overlies and protects the forward edge of the stencil upon said drum adjacent to its lateral edges, substantially as described.

8. The combination with a printing-drum and an underlying platen, of a guide carried by said drum and normally extending fixedly beyond the periphery thereof said guide be ing movable to operative and inoperative positions, a pin carried by said guide, and a spring coacting with said guide to retain the same in either of said positions, substantially as set forth.

9. The combination of a printin -drum, means for rotating the same, an un erlying platen, and guides secured to said drum and movable relatively thereto to operative and inoperative positions, said guides when in o erative position extending beyond the perip ery of the drum and being held stationary relatively to the drum throughout the rotation thereof, substantially as described.

10. The combination of a printing-drum, means for rotating the same, an underlying platen, and guides secured to said drum'in position to coact with the lateral edges only: of a sheet on the drum, said guides being movable relatively to the drum to operative and inoperative positions and when in operative position extending beyond the periphery of the drum, in which position they are held stationary relatively to the drum throughout the rotation thereof, substantially as described.

This specification signed and witnessed this th day of May, 1907.

ALBERT B. DICK.

Witnesses:

R. R. HARRINGTON, M. H. BURKART. 

